Pachysandra procumbens or Allegheny Spurge is a shrubby groundcover that spread via underground rhizomes to form a dense carpet of blue-green leaves marbled with silver and purple. The leaves are arraged in circular patterns around fleshy, erect stems. The foliage is generally deciduous in Zones 5 and 6. Fragrant white flower spikes appear in spring, often before the new leaves emerge. Allegheny Spurge is excellent for shady areas.